CCES call assembler function from C

Hi,

When the compiler generates the assembly version of a C-namespace symbol, it either prepends an underscore or appends a dot to the symbol name.

Compiling with the -char-size-8 switch on processors that support byte-addressing, the asm symbol name will have a dot suffix, otherwise, it will have an underscore prefix.

For example, your assembly function, "_Test_Function" should be renamed to "Test_Function.", To fix the error.

Please find the attached updated project which works fine.

We recommend you refer to CCES help below for more information on Naming Conventions for Symbols
CrossCore® Embedded Studio 2.x.x > SHARC® Development Tools Documentation > C/C++ Compiler Manual for SHARC® Processors > Compiler > C/C++ Run-Time Model and Environment > Function Call and Return > Symbol Names in C/C++ and Assembly


Regards,
Nishanthi.V
4532.test_asm_Core1.zip

thanks for the clarification.

both methods works fine.

- option1   -char-size-8     with a dot suffix after the function name in assembler.

- option2   -char-size-32   with an underscores before the function name in assembler 

We have choices for option 2 (changed the compiler settings to -char-size-32 )

When using the option -char-size-32 we have the follows error messages

adi_gpio.h", line 40: cc0035:  catastrophic error: #error directive: "Only Byte addressing mode is supported

How to resolve this?

Hi,

Could you please try adding "__BYTE_ADDRESSING__" macro in the Preprocessor definitions and build the code.

To do the same, Go to project properties > C/C++ Build > Settings > Tools Settings > Crosscore C/C++ SHARC Compiler > Preprocessor > Preprocessor Definitions

Hope this helps!

Regards,
Nishanthi.V

After adding "__BYTE_ADDRESSING__" macro in the Preprocessor definitions we having the following errors during the link.


[Error li1021] The following symbols referenced in processor 'SC587_CORE_2' could not be resolved:
'adi_int_InstallHandler [_adi_int_InstallHandler]' referenced from 'src\audio_framework\audio_framework.doj'
'adi_int_InstallHandler [_adi_int_InstallHandler]' referenced from 'src\common\sport\sport_flow.doj'
'adi_tmr_Close [_adi_tmr_Close]' referenced from 'src\bsp\systimer\bsp_systimer.doj'
'adi_tmr_DisableOutput [_adi_tmr_DisableOutput]' referenced from 'src\bsp\systimer\bsp_systimer.doj'
'adi_tmr_Enable [_adi_tmr_Enable]' referenced from 'src\bsp\systimer\bsp_systimer.doj'
'adi_tmr_EnableGracefulStop [_adi_tmr_EnableGracefulStop]' referenced from 'src\bsp\systimer\bsp_systimer.doj'
'adi_tmr_Open [_adi_tmr_Open]' referenced from 'src\bsp\systimer\bsp_systimer.doj'
'adi_tmr_SetClkInSource [_adi_tmr_SetClkInSource]' referenced from 'src\bsp\systimer\bsp_systimer.doj'
'adi_tmr_SetEmuRun [_adi_tmr_SetEmuRun]' referenced from 'src\bsp\systimer\bsp_systimer.doj'
'adi_tmr_SetIRQMode [_adi_tmr_SetIRQMode]' referenced from 'src\bsp\systimer\bsp_systimer.doj'
'adi_tmr_SetMode [_adi_tmr_SetMode]' referenced from 'src\bsp\systimer\bsp_systimer.doj'
'adi_tmr_SetPeriod [_adi_tmr_SetPeriod]' referenced from 'src\bsp\systimer\bsp_systimer.doj'
'adi_tmr_SetPulsePolarity [_adi_tmr_SetPulsePolarity]' referenced from 'src\bsp\systimer\bsp_systimer.doj'
'adi_tmr_SetWidth [_adi_tmr_SetWidth]' referenced from 'src\bsp\systimer\bsp_systimer.doj'

Hi,

For SHARC+ processors,the interface to enable interrupts and install interrupt handlers is provided for byte-addressing mode only.

So, the best way to use the ASM symbol name with a dot suffix in SHARC+ byte addressed processors and compile the code with -char-size-8 in default.

Please refer in CCES help:
CrossCore® Embedded Studio 2.x.x > System Run-Time Documentation > Interrupt Support > Interrupt Support Specific to SHARC and SHARC+ Processors > Supported Mode on SHARC+ Processors

Regards,
Nishanthi.V